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Old Mar 30, 2003, 01:41 AM
Baptised Heathen
batman's Avatar
Bundaberg, Qld, Australia
Joined Jun 2002
1,365 Posts
Gws Edf75

I have one of these units coming and have no idea what motor to put in it. Has anyone got one of these and what motor did you use? Was the motor adequate? Is there a better motor? etc etc
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Old Apr 19, 2008, 08:13 PM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,443 Posts
Did you read about GWS new BL2825 motor perform on EDF75?
http://www.rcgroups.com/forums/showthread.php?t=601634

Mar 25, 2008, 09:53 AM
Quote:
Originally Posted by GWS4CEO
Just tested the new winding of GWS BL2825 long 28mm motor as below:

2825(BLUE)             
EDF-75*6
11.1V 35.5A 747g 26.35oz 394.05W 1.90g/W 66.86oz/KW    
14.8V 54.9A 1188g 41.90oz 812.52W 1.46g/W 51.57oz/KW    
                   
EDF-75*4
11.1V 34.2A 698g 24.62oz 379.62W 1.84g/W 64.85oz/KW    
14.8V 52.2A 1082g 38.16oz 772.56W 1.40g/W 49.40oz/KW  
 
2825(RED)             
EDF-75*6
11.1V 69.2A 975g 34.39oz 768.12W 1.27g/W 44.77oz/KW    
12.0V 80.8A 1099g 38.76oz 969.60W 1.13g/W 39.98oz/KW
A few new proto type BL2825 gave even better g/W! Less current.

I will record the dadtas and post there soon.
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Old Apr 22, 2008, 10:43 AM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
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The new GWS BL2825XX tested with EDF75

2825-2(Blue) Noload current @11.1V 5.60A     KV: 2900  
EDF-75*6 14.8V 45.2A 1008g 35.55oz 668.96 1.51g/W 53.15oz/KW    
EDF-75*4 14.8V 44.4A 990g 34.92oz 657.12 1.51 g/W 53.14oz/KW    
                   
2825-3(RED) Nolad current @11.1V 10.20A     KV: 4100
EDF-75*6 11.1V 65.1A 982g 34.64oz 722.61 1.36g/W 47.93oz/KW
EDF-75*4 11.1V 63.9A 951g 33.54oz 709.29 1.34 g/W 47.29oz/KW    

Altough the max out put reduced, but I am happy the current rating under loaded were great reduced, efficiency getting better!

So, we can save the weight of battery pack, yet cost down a lot to pay for high C battery!

May be you already had a lot Li-Po packs in hand still can be applied on this current rating demand.

Wish this improvement will help?
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Old Apr 22, 2008, 04:09 PM
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Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,053 Posts
No load current = 10.2A? That is ridiculous!

Sorry, but I would prefer the previous 2825(blue) motor. 747g at 35A is a good power level on 3S. The new 2825-2(blue) may be a bit weak on 3S, and the 2825-3(red) is way over the top



   
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Old Apr 23, 2008, 08:29 AM
Baptised Heathen
batman's Avatar
Bundaberg, Qld, Australia
Joined Jun 2002
1,365 Posts
Wow, thanks for the replies after 5 years. Proves that threads never die here. I wonder if we are even talking about the same unit after all this time. Now I may have to see if I can find it, thanks guys!!!
The Red motor certainly draws too much current. I wonder how long it can draw that sort of current and stay in one piece. 10.2 amps with no load? and I don't have any batteries that can supply it loaded.
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Old Apr 23, 2008, 09:12 AM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
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How long is a 138g motor going to last with 700W through it - the equivalent Himaxx 2825 is rated at 25-30A max! Himaxx's of similar Kv have no-load of just over 1A - something is seriously amiss if these GWS motors are at 5.6A/10.2A.
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Old Apr 24, 2008, 05:10 AM
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Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
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2825-3(RED) no-load power dissipation = 113W (10.2A x 11.1V). If the loaded motor is running at peak efficiency then power dissipation will double to 226W. It will need some serious cooling to last more than a few seconds. Certainly the fan duct is good location to get it, but I think a big finned heatsink will be essential!

Quote:
Originally Posted by Dr Kiwi
something is seriously amiss if these GWS motors are at 5.6A/10.2A.
They are obviously optimized for high power output. This can be achieved by winding less turns and using strong magnets, but no-load current and peak efficiency often suffer due to increased magnetic losses. This has been taken to extremes with the 2825-3(RED), as the maximum efficiency it can manage at 11.1V is only 69%.
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Old Apr 24, 2008, 10:13 PM
Baptised Heathen
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Bundaberg, Qld, Australia
Joined Jun 2002
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I don't have a power station light enough to power it. Seriously, if you were to put enough batteries in the plane to power it the thing would be too heavy to fly, surely.
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Old Apr 24, 2008, 11:06 PM
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Chattanooga, Tennessee, United States
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It may well fry before it can fly!
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Old Sep 13, 2010, 02:51 PM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,443 Posts
During SZ model show, that we had shown the live test GWS EDF75 system to visitors.

We had 1.4+Kg thrust with a new proto type out runner BL motor 3250Kv at 18.5V ( DC power supply ) 60+A.

I believe this will help GWS EDF75 JETs become popular!

Any suggestion to have EDF75 run even better result?
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Old Sep 14, 2010, 09:12 PM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,443 Posts
This prtotype is 3250Kv. Run up to 5 cells.

But other friends say to me that would be better to lower Kv a little, so this can fit with 6 cells that can easy to hook up with 2 of 3 cells.

How do you think?
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